Initial release of DHtml output format

Mostly feature complete first release.  

Some known issues:
- images are not supported yet
- test results do not show inconclusive result, only pass, fail or nothing
- package and delivery mechanism relies on manually created zip file
- HTML and DHtml output cannot be generated at the same time in the same output directory without conflicts occurring
- I have not tested the powershell, nant or MSBuild runners, but it appears they should work

Likely there are other unknown issues I did not discover or have forgotten about.  Please let me know if you find any.